Help needed with Hyde Generator

[Steven Dufresne]

Hi All,
I need help finding a suitable motor for the Hyde generator (US patent 4897592):
http://www.google.com/patents?id=HX4BAAAAEBAJ&dq=4897592
which I'm trying to build. One of Hyde's generators allegedly used an input of 2.4kW to get an output of 22.9kW. The problem is that it needs to rotate at at least 6000 RPM and the most I've been able to get to without too much shaking is around 2700 RPM. See the photo below. I've used this vacuum cleaner motor in the past to spin something to above 8000 RPM but that was something which was attached just above the shaft coming out of the motor whereas my Hyde generator has a 16" shaft with two discs on it.

So I'm thinking of going with something more like what he uses in his patent. See the drawing from his patent below, item 28. That's a motor with the shaft coming out of both sides. That would be better because I could attach directly to the motor shaft and the shaft would be shorter. (Also, who knows, there may be something important about the rotating
magnetic fields of the motor in between the two discs?) Bench grinder motors top out at around 3600 RPM so they're no good.

So I went shopping for motors today and found that the fastest of these type I could find go to around 3000 RPM - far less than the 6000-7000 RPM I need. Can anyone advise me on where/how to get such a motor, if such a beast exists. Obviously Hyde found one.
Thanks,
Steve
http://rimstar.org   http://wsminfo.org

[Nali2001]

You can us use a washing machine motor http://www.tdspares.co.uk/prodimages/mtr1003.jpg this thing can be obtained from repair shops and just about anywhere, hell you can even go to any recycle center and take them out of some broken wasting machines.
I got like 7 on one trip. Anyway these can do like 0 to 13000 rpm.

The best thing is these washing machine motors are so called "universal motors" http://www.phys.unsw.edu.au/hsc/hsc/electric_motors2.html and so have an Ac powered field winding and a Ac powered commutator.

This motor in combination with a (preferably two) variac http://en.wikipedia.org/wiki/Variac#Variable_autotransformers will allow you to have full rpm range control.

This is in my opinion you best option.
Regards,
Steven

[Steven Dufresne]

@Steven,
Thanks for the suggestions but I really need a motor where the shaft comes out of both sides as in the patent drawing above. My vacuum cleaner motor can already give me more than the speed I need, but the shaft extends out only one side. Your mention of the variac does remind me that I'd prefer the motor be variable speed, or controllable with a variac, so that I can start it up slowly - but again, the shaft has to come out of both sides, otherwise I can just use my existing motor.
-Steve
http://rimstar.org   http://wsminfo.org

[Paul-R]

So I'm thinking of going with something more like what he uses in his patent. See the drawing from his patent below, item 28. That's a motor with the shaft coming out of both sides.

How about one of those bench grinders with a wheel on each side?
Strip it for the motor.

The speed may be an issue. There may be smaller ones for
polishing jewelry or silversmithing that may run fast.
Paul.

[Nali2001]

Well you could use a bench grinder motor and a one phase variable frequency drive.
Since induction motors get their speed from line frequency and not amps, you can change the rpm of a induction motor by increasing the ac line frequency. You can get these variable frequency drive second hand from ebay:
http://en.wikipedia.org/wiki/Variable-frequency_drive